Power Distribution

Q.

What is the standard voltage for households in India?

1. 440 V

2. 220 V

3. 110 V

4. 55 V

Q. The potential difference between a phase line and the earth wire in a household, is

1. 300 V
2. 110 V
3. 440 V
4. 220 V

Q.

The potential difference maintained between the live wire and neutral wire in India is

1. 220 V

2. 240 V

3. 440 V

4. 420 V

Q.

In a step-up transformer the number of turns, in the secondary coil are more than the number of turns in the primary coil. Thus the

i) voltage and

ii) current in the secondary coil is

1. i) More and ii) Less than that in the primary coil

2. i) More and ii) More than that in the primary coil

3. i) Less and ii) More than that in the primary coil

4. i) Less and ii) Less than that in the primary coil

Q.

Different stages of power transmission and distribution are given in the following chart:

Arrange the given terms in the above boxes in the correct order.

Power generator, Substation, Star connection, Power transformer, Distribution transformer, Household connection.

Which of the following is correctly matched?

1. A - Star connection

2. C - Substation

3. E - Distribution transformer

4. B - Power generator

Q.

Name the device used to (a) increase the voltage at the generating station, and (b) decrease the voltage at the substation for its supply.

Q.

What is phase in electricals

Q.

difference between overloading and short circuiting

Q. Which of the following is/are correct about a step-up transformer?

1. Secondary voltage is more than primary voltage.
2. Primary voltage is more than secondary voltage.
3. Number of turns in primary coil is more than secondary coil.
4. Number of turns in secondary coil is more than primary coil.

Q.

In which of the following stages of power distribution a step-down transformer is used?

1. Long distant transmission

2. Domestic distribution

3. Just after power generation

4. Not used in power transmission

Q. A coil of wire of 1000 turns has self inductance 120 millinery. What is the self inductance of a coil of 250 turns?

Q.

How is difference of pressure at two points in an electric circuit

Q.

The reduction in the allotted quantity of electricity to the consumer is known as

1. Load shedding

2. Power drop

3. Power cut

4. Power loss

Q. A Zener diode acts as a

1. The current in the reverse biased condition is generally very small
2. The current in the reverse biased condition is small but the forward biased current is independent of the bias voltage
3. The forward biased current is very small in comparison to reverse biased current
4. The reverse biased current is strongly dependent on the applied bias voltage

Q. A modem is connected between a telephone line and a

1. Network
2. Computer
3. Communication adapter
4. Serial port

Q.

What is the main cause of zener breakdown?

Q.

In the following diagram, Calculate the approximate current in branch A and Branch B of the circuit.

1. 0.045 A and 0.035 A

2. 0.077 A and 0.042 A

3. 0.097 A and 0.099 A

4. 0.045 A and 0.049 A

5. 0.097 A and 0.049 A

Q. Which of the following flip-flops is free from race around condition?

1. All of the above
2. T flip-flop
3. SR flip-flop
4. Master slave JK flip-flop

Q. Switching Mode Power Supply.

1. Converts raw input power to the power
2. Converts D.C. to A.C.
3. Enhances output of a circuit
4. Switches to and for between high and low power fluctuations